Josh Brolin stars as Thanos in the upcoming superhero showdown Avengers: Infinity War and he's promised that the full story of the film is "incredible".

Chatting exclusively to Digital Spy to promote the DVD and Blu-ray release of the Coen brothers' '50s Hollywood-set comedy Hail, Caesar!, the actor was understandably guarded about the two-part Marvel blockbuster.

"I literally can't say one word about it, but it's an incredible story," he told DS. "There's no script yet. But I do know the story inside and out and it's an amazing story.

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"I sat at a table and listened to the story and was completely and utterly blown away. I was told it by all the people involved. It was a large table, I'll put it that way!"